Pneumatic-action mechanism.



N E s N, A R B L U nu G A PNEUKATIC ACTION IKEGHANISM.v

l A'YPIJOATIOB FILED. DE@ l1. U08.-

27'v EEEEE:

Axl JMU( SEH the bar, but I prefer tohave this connection rigid, avoiding thereby the necessity of guide ing means for the valve, which is necessary where the valve is disconnected from the bar 5 or diaphragm.

The upper diaphragm chamber communi-V cates through passageway 25with the low pressure chamber 26, and -the lower diaphragm chamber communicates through passageway 27 and tube 27 with passageway 28, which passageway 28 in practice is connected with an opening inthe tracker-board. The lower diaphragm chamber also communicates with the low pressure chamber through a restricted opening 29 in the disk 30 covering the end of the passageway 27.

The operation is as follows: The parts are normally in the position shown. Vhen the music sheet opens the end of the passageway 28 air or atmospheric pressure rushes through the assageways 28 and 27 into the lower diap agm chamber to throw the diaphragm upyvardly, this upward movement of the diap agm, being communicated to the bar 20 and eventually tothe valve lwhich'is raised to its upper position. The valve chamber is thus dlsconnected from atmosphere and connected with the low -pressure chamber through the passageway 25, and the bellows 30 are therefore placed in communication with the low pressure ,chamber by 'way of the. passageways 18 and 19, the valve chamber,

Vopening 13 and passageway 25-and immediately collapse, their combined force being` accumulated to act on the striking mechanism engaged by the abutments 6. When'the end of theV assageway 28 is again closed the pressure o the upper and lower diaphragm chambers, again becomes that of the low 40 pressure chamber, this equalization bein enabled by the equalizing opening 29. his

lever arrangementbetween the diaphragm' and the valve 'enables me to attain the desired ower to l operate the valve with a limited Iinitial diaphragm actuating power and the action of the actuatingdevice is very strong and reliable. enables me to give the valve a vertical' movement greater or less than the vertical movement of the diaphragm, which is also sometimes desirable.

Each actuating mechanism is a unitary self-containedstructure, the parts being very compactly arranged, the drawings showing the actual size of each unit, and these units are arranged in horizontal and staggered rows, each unit being secured at its end to the rear wall of the low pressure chamber' by screws 31, the abutments 6 when the units are :thus arranged being alined to register with' the abstract ro'ds of the instrument so .thatA 'the connection between the abutments and''the abstract rods may be direct. By withdrawing its screws 31 any unit may be.

,65 withdrawn fromftlie instrument independthe dia This lever arrangement alsoA ently of and without interfering with the other units.

I do not wish'to be limited to the exact arrangement shown, as changes may readily be m'ade without departing from the scope of my invention.

I claim as Anew and desire to secure by Letters Patent:

1. In pneumatic action mechanism for mechanically operated instruments, the combination of a mounting block, a bellows suported from the under side of the m'ounting lock, said mounting block -forming one member of said bellows, a valve block on said mountingl block, a valve supported on said valve block, a dia hragm mounted in the mounting block, a ever pivoted at one end'to the mounting block -and engaged lby hragm and by the valve, movements of the 'aphragm being transmitted through 85 the lever to the valve.

2. yIn pneumatic action mechanism for automatically operated instruments, the combination. of a mounting block, Va bellows mounted below said block, said block forming one of the members of said'bellows, a diaphragm mounted in said block, a valve block on the mounting block, a valve chamber in the valve block connected with the bellows, a valve in said valve chamber, a lever dis osed 4between the valve and diaphragm an pivoted at one end to the mounting lock whereby movements of the diaphragm are transl mitted through the lever to the valve, and guiding means for the lever.

3. In' pneumatic action mechanism for automatically operated pianos, the combination vof a mounting block, a diaphragm i mounted in said block, a bellows supported below theblock, a valve block on the mounting block, a valve chamber in said valve block having connection with the bellows, a lever. pivoted at one end to the mounting block and extending between the diaphragm-V and valve, engagement of the diaphragm and valve with the lever `upon movement of the diaphragm being at different points, whereby the movements of the dia hragm'are either multiplied or reduced be ore reaching the Valve.

4. In pneumatic action mechanism for automatically operated pianos, the combination of a mounting block, a bellows supported from the mounting block, a diaphragm chamber' in said block, a diaphragm 120'A from the diaphra m to the lever, the oints f between lthe da 'hragm-and valve, whereby ofengagement o the valve and diaplragm movements of the dlaphragm are transmitwith the lever being in dierent planes. y ted through the lever to the valve, and a 15 5. In pneumatic action mechanism for aui guide post 23 engaging inthe bifurcated end 5 tomaticall)T operatedinstruments, the com- -22 of the lever' for guiding said lever-..1 bination of a mounting block 1, a bellows 2 In witness whereof, I hereunto subscribe 4 supported below the mounting blockJ a diamy name this 5th day of December A. D., hragnr chamber 8, a diaphragm 9, a valve 1906. v block'll having a valve` chamber 12, a valve AXEL G. GULBRANSN. 10 in the chambena lever 20 having a bifur- VVitnessesz 4cated end 22, said lever being pivoted to the LEONARD W. N OVANDER,

' mounting'block at one end and extending ARTHUR H. BOE'ITCHER. 

